Process of making cement.



UNITED STATES PATENT OFF C OTTO FRIZ, OF NUREMBERG, GERMANY, ASSIGNOR TO0. A. KAPFERER AND WILHELM SOHLEUNING,

OF MUNICH, GERMANY.

PROCESS OF MAKING CEMENT.

SPECIFICATION forming part of Letters Patent No. 698,268, dated April22, 1902.

Application filed November 15, 1899.

for decorative purposes, artificial stone,'and

the like. For this object a clay which is free from iron (kaolin,pipe-clay, and the like) is mixed with feldspar, (orthoclase or itsequivalent,) which is also as free as possible from iron, and with lime,which must of course also be as free from iron as possible. The mixtureof kaolin and feldspar before mentioned may be regulated in such awaythat the high fusing temperature caused by the absence of iron compoundsand alkalies and also the too high alumina contents caused by theintroduction of the kaolin are reduced and may I be confined to theconditions proved to yield the best cement. The mixture is treated withthe necessary amount of lime inthe manner usual in cement-making andyields when burned to the fusing-pointthat is, beyond the sinteringlimit-a product which hardens equal to the best cement.

As example for a favorable combination the following figures serve, and,in fact, raw material may be prescribed as follows: a normal kaolin withforty-seven per cent. SiO thirty-nine per cent. Al O fourteenper cent. HO, total one'hundred; normal plagioclase (Albit) with 68.68 per cent.SiO 19.48 per cent.'Al O ,"1l.84 per cent. Na O, total one hundred. Ifthese stuffs are mixed in the proportion of four to six, respectively, amaterial will be obtained of the combination 60.008 per cent. SiO 27.288per cent.

Serial No. 737,078. (No specimens.)

A1 0 7.104 per cent. Na O, 5.600 per cent. H O, total, one hundred. Byaddition of carbonate of lime (limestone) a crude meal is combined ofthe following nature: 15.002 per cent. SiO 6.822 per cent. Al O 1.776per cent. Na O, 1.400 per cent. H O, 75.000 per cent. OaOO total onehundred, which corresponds toa cement of 22.868 SiO 10.400 A1 0 2.707 NaO, 64.025 OaO. If now the brick is burned to the usual .sintering, thusto a quality resembling pumice-stone, the re* sult is similar to Romancement, however, like the above described, of clear material.

The proportions of the ingredients of the .55 cement result from theproportions of the crude meal as follows, to wit: The;propor-' tions ofcourse change by firing, the Water and the carbonic acid being expelled,so that,

for instance, out of one hundred parts of can boniferous limestonefifty-six parts of oxid of calcium are produced and forty-four parts ofcarbonic acid are expelled. The mixture of the crude meal given abovewill lose by firing 34.4 per cent. of Water and thirty-three per cent.of carbonic'acid out of the seventyfive per cent. of carboniferouslimestone, (CaOo The process of manufacturingWhite ce-7o,

ment, consisting in the admixture of lime and clay as free as possiblefrom iron, together with feldspar, in about the proportions stated, andburning the resultant mass to the verge of fusing, thatis to say, beyondthe sintering '75 limit. v

In testimony whereof I aflix my-signature in presence of two witnesses.

'. OTTO FRIZ.

Witnesses: r a I 1 HEINRICH FIRTH, OSCAR BOOK.

